JP3102852B2 - Blood pressure measurement device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a blood pressure measurement device, and more particularly to a blood pressure measurement device configured to measure a blood pressure value using a microcomputer or the like.

[0002]

2. Description of the Related Art In general, a blood pressure measurement device pressurizes the inside of an arm band with a pressurizing pump, exhausts the air, and reduces the pressure. At the same time, the pressure in the arm band is detected by a pressure sensor and the Korotkoff sound sensor is used. A sound is detected, output signals of both sensors are processed by a microcomputer, and a systolic blood pressure value and a diastolic blood pressure value are derived and displayed on a display device.

Conventionally, in a blood pressure measuring device using a microcomputer of this type, when a person other than a doctor measures whether the blood pressure value is normal or abnormal, and if it is abnormal, it measures whether it is high or low. Also, a device has been devised to facilitate the determination.

For example, Japanese Patent Application Laid-Open No. 61-128940 discloses an arm band, a pressurizing pump as a pressurizing means for pressurizing the inside of the arm band, and a pressure sensor as a detecting means for detecting the pressure in the arm band. And a Korotkoff sound sensor as information detecting means for detecting blood vessel information by decompressing the inside of the arm band, a pressure sensor as the pressure detecting means, and a systolic blood pressure value based on an output signal of the Korotkoff sound sensor as information detecting means. And a blood pressure measuring device for measuring the maximum and minimum blood pressure values provided with a blood pressure deriving means (microcomputer) for deriving a diastolic blood pressure value. The known data of the blood pressure value measured in advance (WHO (World Health Organization) reference data) Or a normal value of a person to be measured), a determining means for comparing the measured blood pressure value with the known data for evaluation, and a notification for notifying the determination result of the determining means by voice. Stage and is provided, if the blood pressure is high or low, or blood pressure measuring apparatus which is notified by voice determination of such normal, whether there is disclosed.

[0005]

However, in general, blood pressure fluctuates depending on the time, environment, and mental state measured by the subject. In this regard, in the conventional blood pressure measurement device, the influence of the psychological state of the subject remains included in the measurement value of the blood pressure, and therefore, the measurement value of the blood pressure does not necessarily indicate an accurate blood pressure value. It was hard to say that there was.

Accordingly, an object of the present invention is to accurately grasp the mental state of the subject by using the brain waves of the subject and remove the influence of the mental state of the subject from the measured value of blood pressure. Another object of the present invention is to provide a blood pressure measuring device capable of obtaining an accurate blood pressure value.

[0007]

Means for Solving the Problems In order to achieve the above object, the present invention is configured as follows.

A blood pressure measuring device according to the present invention measures a subject's blood pressure, measures the systolic blood pressure value and the diastolic blood pressure value, and displays them on a display device. An electroencephalogram measurement device, an analysis data table storing analysis data obtained by analyzing a psychological state such as a calm state and a nervous state according to the state of the electroencephalogram, and a correction amount of a blood pressure value to be corrected according to the analysis data are stored. A blood pressure value correction data table and an electroencephalogram from an electroencephalograph are analyzed to determine a state of the electroencephalogram, analysis data corresponding to the state of the electroencephalogram is searched from the analysis data table, and a blood pressure value corresponding to the analysis data is obtained. And a correction means for retrieving a correction amount from the blood pressure value correction data table and correcting the systolic blood pressure value and the diastolic blood pressure value of the subject based on the correction amount of the blood pressure value.

In the above invention, the psychological state of the subject is determined based on the brain waves of the subject measured by the electroencephalograph, and the analysis data table referred to at that time includes the type and strength of the brain wave. Since the psychological state data is associated with the combination, the psychological state of the subject can be appropriately determined. In addition, since the configuration is provided with a correction unit that determines the correction amount of the blood pressure value according to the determined psychological state of the subject, for example, if the mental state is a calm state, there is no correction of the blood pressure value, if the tension state, For example, it is possible to make a correction such as giving a correction amount that makes the blood pressure value smaller, and thereby, the blood pressure value affected by the psychological state of the subject can be returned to an accurate value. This corrects the increase in blood pressure caused by the tension, even for patients whose blood pressure measured in front of a doctor or nurse in a white coat is higher than that measured at home, for example. This means that the measurement accuracy can be made closer to the same measurement accuracy as that measured at rest.

[0010] The electroencephalogram refers to at least two types of α waves, β waves, θ waves, and δ waves including at least α waves and β waves.
The shape and the number of channels of the electroencephalograph are not particularly limited as long as they can analyze the frequency components of the electroencephalograms of the right brain and the left brain.

In the present invention, a diagnostic data table further storing diagnostic data corresponding to the blood pressure fluctuation rate, a blood pressure fluctuation rate is obtained from the blood pressure being measured, and the diagnostic data corresponding to the fluctuation rate is converted into the diagnostic data. It is preferable to include means for searching a data table and displaying diagnostic advice based on the diagnostic data on the display device.

By obtaining the rate of change of blood pressure with respect to the change in psychological state in this manner, the result of analyzing the electroencephalogram can point out the possibility of a medical condition caused by hypertension, cerebral infarction and other vascular problems. , Preventative and conservative diagnosis. For example, if the patient's blood pressure rises significantly with only a slight increase in excitement,
It is possible to inform the patient of the risk that "there is a risk of cerebral infarction and the like."

[0013]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 shows a blood pressure measuring device using a microcomputer.
A display device 1 composed of a display such as a liquid crystal display, a TV monitor, a CRT, etc .; an input means 2 composed of a power switch, a pressurization start button or the like, a keyboard, etc .; CPU 41, RAM 42, image processing unit 43, ROM storing first file D8, second file D
A rewritable external storage device storing the ninth to sixth files D13 is connected. Further, an electroencephalogram measuring device 5 for detecting the psychological state of the subject is connected to the bus line 6 of the blood pressure measuring device, and the electroencephalogram measurement value obtained from the electroencephalography measuring device 5 is input to the CPU 41. It is supposed to be.

Although not shown, the blood pressure measuring device 3 includes a pressurizing pump as pressurizing means for pressurizing the inside of the arm band, a pressure sensor as detecting means for detecting the pressure in the arm band, and a pressure sensor inside the arm band. And a Korotkoff sound sensor as information detecting means for detecting blood vessel information by reducing pressure.

The microcomputer 4 receives the output signals of the pressure sensor and the Korotkoff sound sensor of the blood pressure measuring device 3 and has a software blood pressure measurement program D81 for measuring the systolic blood pressure value and the diastolic blood pressure value based on the signals. .

The electroencephalogram measuring device 5 used in the present invention is also known per se. When the electroencephalogram sensor is mounted on the head, the electrodes inside the electroencephalogram sensor come into contact with the scalp.

The electroencephalogram pattern changes very sensitively depending on the level of consciousness. EEG patterns corresponding to changes in the level of consciousness of human beings indicate that in a psychological state with eyes closed and calm,
A wave of 3 Hz (this is called an α wave) appears on the occipital region and the top of the head. When you open your eyes or think about things, the amplitude of the alpha wave decreases or disappears,
A fast wave (β wave) of 4 to 25 Hz appears.

When sleeping from an awake state, a unique pattern appears in response to a decrease in the level of consciousness.
When it becomes more and more insignificant, the α-wave becomes less and becomes a flat pattern as a whole.
A 7 Hz wave (θ wave) follows. When I fall asleep, 14
Although a spindle-shaped wave of Hz is mixed, a deeper sleep leads to a slow wave (δ wave) having a large amplitude of 0.5 to 3.5 Hz.

The present invention is to construct a blood pressure measuring device which analyzes a mental state from an electroencephalogram pattern of a subject measuring a blood pressure and corrects a blood pressure value to a correct value according to the analyzed mental state. is there.

As mentioned above, the ROM and the external storage device are connected to the bus line 6 for storing the first file D8 and the second file D9 to the sixth file D13, respectively.

The first file D8 stores a blood pressure measurement program D81, an electroencephalogram analysis program D82, and the like. The second file D9 stores an analysis data table that associates the analysis data corresponding to the state of the brain wave (combination of the type of brain wave (α wave, β wave, θ wave, δ wave) and the intensity). . The third file D10 stores a mental state data table in which the mental state is associated with the psychological analysis data. The fourth file D11 stores a blood pressure value correction data table in which the correction of the blood pressure value is associated with the analysis data. The fifth file D12 stores a blood pressure value reference data table that associates reference diastolic blood pressure values and reference systolic blood pressure value data that serve as references for age and gender. Further, the sixth file D13
Stores a diagnostic data table in which diagnostic data for preventive maintenance is associated with the fluctuation ratio of the blood pressure value. These second file D9 to sixth file D13
Can be changed separately.

The CPU 41, which is the core of the microcomputer 4 in the blood pressure measurement apparatus, executes the blood pressure measurement program D81 and the electroencephalogram measurement program D82, instructs image data to be displayed, and analyzes the mental state based on the analysis result of the electroencephalogram. Correction, diagnosis, etc. of the blood pressure value to be performed are performed. R
The AM 42 temporarily stores the state of the electroencephalogram for measurement and the image data for display.
In accordance with an instruction from 41, necessary image data is generated, and a measurement result or the like is displayed on the display device 1.

The analysis data table stored in the second file D9 contains the types of brain waves (α wave, β wave, θ wave).
The classification data (analysis data) of the psychological state corresponds to the combination of the wave and the δ wave) and the strength. Specifically, when brain waves such as “α wave is strong”, “β wave is strong”, “θ wave is strong”, and “δ wave is strong” appear, the mental state of the subject in each case is “ Normal state ",
Since the state corresponds to a state such as “tension state”, “light sleep state”, and “deep sleep state”, “α wave is strong”, “β wave is strong”, “θ wave is strong”, “δ "A""B" in order of "wave is strong", "not applicable"
Classification of "C", "D", and "E" is performed, and this is positioned as basic analysis data.

The psychological state data table stored in the third file D10 contains image information (A, B, C, D, and E) to be displayed for the analysis data. Messages, pictures, etc.) as psychological expressions. Specifically, the analysis data “A” indicates that “the state of being physically and mentally at ease (a calm state)”, and the analysis data “B” indicates that the “reading a book,
When you think or when your emotions rise (tensions). In the analysis data "C", the content is "going to sleep from an awake state (depressed state)", and in the analysis data "D", the content is "to go into deep sleep (sleep state)." In the analysis data “E”, the content “cannot be specified.” Is associated.

Further, the psychological evaluation data table stored in the fourth file D11 corrects the blood pressure value for "A", "B", "C", "D" and "E" of the analysis data. The evaluation weights (presence / absence and amount of correction and sign) are stored in association with each other. The specific evaluation is “no correction” for the analysis data “A”, and the analysis data “B” to “D”
If it is, "the correction according to the change ratio of the blood pressure value" is performed, and if the analysis data "E" is "no correction", the respective contents are associated in the form of the respective correction flags.

The fifth file D12 contains WHO (World Health Organization) as known data of blood pressure values measured in advance.
The reference diastolic blood pressure value and the reference systolic blood pressure value data serving as a reference for the age and sex of the subject are stored. The age and gender of the subject are input by the input means 2.

Further, in the sixth file D13, diagnostic data which is preventive and conservative with respect to the change ratio of the blood pressure value is provided. If it is "other than that," it is memorized as "It is important to monitor blood pressure every day."

Next, the operation of the blood pressure measuring device will be described with reference to FIGS.

(1) First, in step A1, pressurization for measuring blood pressure is started. In addition, the existing measurement method is used for the measurement of the blood pressure, and the arm band is wound around the arm. In addition, the measurement of the brain wave uses the existing measurement method, and the brain wave sensor is attached to the head.
Fix in band format.

The blood pressure measurement program D81 uses the blood pressure measurement device 3 to perform blood pressure measurement control (generally optimally pressurizing the arm band and then depressurization) and measurement by the CPU 41. In parallel with this, the electroencephalogram analysis program D82 performs electroencephalogram measurement control and measurement by the CPU 41 using the electroencephalogram measurement device 5.

(2) In step A2, the systolic blood pressure is measured by the blood pressure measuring device 3, and the electroencephalographic measurement is also performed by the electroencephalographic measuring device 5 at this time.

(3) In step A3, a subroutine "correction of blood pressure value according to mental state" is called and the processing is performed. This is because some subjects may be nervous in front of a doctor or a nurse, or the patient may be in a light sleep state. In the blood pressure value correction processing here, the mental state is analyzed from the electroencephalogram, and the blood pressure value obtained in step A2 is corrected, which will be described later in detail with reference to FIG.

(4) In step A4, it is determined whether or not the systolic blood pressure measurement has been completed. If the measurement has been completed, the process proceeds to step A5. If the measurement is in progress, the process returns to step A2.
Each branch.

(5) Next, in step A5, the diastolic blood pressure is measured by the blood pressure measuring device 3, and the electroencephalogram is also measured by the electroencephalographic measuring device 5 at this time.

(6) In step A6, the subroutine "correction of blood pressure value according to mental state" in FIG. 3 is called, and the mental state is analyzed from brain waves, as will be described in detail later.
The minimum blood pressure value calculated in step A2 is corrected.

(7) In step A7, it is determined whether or not the diastolic blood pressure measurement has been completed.
If the measurement is in progress, the process branches to return to step A5.

(8) In step A8, a preventive and conservative diagnosis (FIG. 4) is performed based on the measured blood pressure value and mental state.

(9) In step A9, the measurement results (systolic blood pressure value, diastolic blood pressure value, diagnosis result, etc.) are displayed on the display device 1.

FIG. 3 shows the processing contents of the subroutine "correction of blood pressure value according to mental state" called at steps A3 and A6. This is a portion that functions as a correction unit that determines a correction amount of the blood pressure value according to a state.

(1) First, in step B1, the measured brain waves are subjected to frequency analysis for α, β, θ, and δ waves. This can be performed by frequency discrimination utilizing the difference in the frequencies of the α, β, θ, and δ waves.

(2) Next, in steps B2 to B5, based on the obtained analysis results, the analysis data table of the file D9 shown in FIG. 1 is searched to extract one of the corresponding analysis data. Determine the psychological state of the subject. That is, steps B2 to B5 function as a psychological state determining means. This psychological state determining means is a combination of the type and the intensity of the brain wave, “strong α wave”, “strong β wave”, “strong θ wave”, “strong δ wave”, “not applicable to these. "A""B""C"
It is determined to be one of "D" and "E".

(3) In step B2, it is determined whether or not the α wave is strong based on the analysis result in step B1. When the α-wave is strong, it is determined that the analysis data “A”, that is, the psychological state is “normal state” in which the body is physically and mentally at ease and the blood pressure value is not required to be corrected. In this case, the program proceeds to step B8 to select “normal state” from the psychological state data table of the file D10 and select “no correction” from the blood pressure value correction data table of the file D11. Therefore, as a result, the blood pressure value is not corrected, and the process proceeds to step B7. On the other hand, if the analysis result in step B1 indicates that the α-wave is weak, the process proceeds to step B3.

(4) In step B3, it is determined whether or not the β wave is strong based on the analysis result in step B1. If the β wave is strong, the analysis data “B”, that is, the mental state indicates that the book is read or thought. Or a "tension state" such as when an emotion is worn, and it is determined that the blood pressure value needs to be corrected. In this case, the program proceeds to step B9, in which “tension state” is selected from the psychological state data table of the file D10, and “correction according to the change ratio of the blood pressure value” is performed from the blood pressure value correction data table of the file D11.
And execute the contents. Then, after performing the correction according to the change ratio of the blood pressure value, step B
Go to 7. On the other hand, when the β wave is weak from the analysis result of step B1, the process proceeds to step B4.

(5) In step B4, it is determined whether or not the θ wave is strong based on the analysis result in step B1. If the θ wave is strong, the analysis data “C”, that is, the psychological state is shallow from the awake state to the sleep state It is determined that the sleep state is “depressed and depressed” and that the blood pressure value needs to be corrected. in this case,
The program proceeds to step B10, and the state “depressed” is obtained from the psychological state data table of the file D10.
Is selected, and “correction according to the change ratio of blood pressure value” is selected from the blood pressure value correction data table of the file D11, and the content is executed. After performing the correction according to the change rate of the blood pressure value, the process proceeds to step B7. on the other hand,
If the analysis result in step B1 indicates that the θ wave is weak, the process proceeds to step B5.

(6) In step B5, it is determined from the analysis result in step B1 whether the δ wave is strong. If the δ wave is strong, the analysis data “C”, that is, the psychological state is “deep sleep” and the blood pressure is It is determined that the value needs to be corrected. In other words, the process proceeds to step B10, where “deep sleep state” is selected from the psychological state data table of the file D10, and “correction according to the change ratio of the blood pressure value” is selected from the blood pressure value correction data table of the file D11. Execute the contents. After performing the correction according to the change rate of the blood pressure value, the process proceeds to step B7. On the other hand, if the δ wave is weak from the analysis result of step B1, the process proceeds to step B6.

(7) Since there is no corresponding frequency band in step B6, the flow proceeds to step B7 without correcting the blood pressure value.

(8) The process ends in step B7,
To step A3 or A6.

FIG. 4 shows the processing contents of the subroutine "diagnosis" called at step A8.

(1) In step A8, preventive and conservative diagnosis is started based on the measured blood pressure value and psychological state. First, in step C1, a reference systolic blood pressure value and a reference diastolic blood pressure value corresponding to age and gender are obtained from WHO (World Health Organization) reference data or the like, which is existing data stored in the file D12. It is assumed that the age and gender of the subject have already been input by the input means D2 for convenience.

(2) In step C2, the reference diastolic blood pressure value obtained in step C1 is compared with the measured diastolic blood pressure value. If the measured diastolic blood pressure value is not low, step C3 is executed.
If the measured diastolic blood pressure value is low, the flow branches to step C5. In step C5, since the diastolic blood pressure value is low, it is diagnosed that "there is a possibility of hypotension", and the process proceeds to step C4 to end the diagnostic processing.

(3) In step C3, the reference systolic blood pressure value obtained in step C1 is compared with the measured systolic blood pressure value, and if the measured systolic blood pressure value is high, the flow proceeds to step C6.
Otherwise, the process branches to step C4.

(4) In step C6, it is determined whether or not the rate of change of the blood pressure value during the measurement is large. If the rate of change is large, the flow branches to step C8, otherwise the flow branches to step C7. In Step C7, since it is determined that the fluctuation rate of the blood pressure value is not large, it is diagnosed that "There is a possibility of high blood pressure. Daily monitoring of blood pressure is important." And the process proceeds to Step C4. In step C8, since it is determined that the rate of change of the blood pressure value is large,
Diagnose "There is a risk of hypertension. Please make a diagnosis with a specialist." And proceed to step C4 to end the diagnosis process.

The blood pressure measuring method and the brain wave measuring method in the present invention are not limited to those of the embodiment, and any method can be adopted.

As described above, according to the present embodiment,
An electroencephalogram measurement device, storage means for storing an analysis data table, and correction means for determining a correction amount of the blood pressure value according to the psychological state of the subject, and measuring the electroencephalogram of the subject with the electroencephalograph Then, the analysis data table is searched based on the brain wave analysis value of the subject to determine the psychological state of the subject, and the analysis data table is based on the combination of the type and the strength of the brain wave. Since the psychological state data is associated with the psychological state data, the psychological state of the subject can be appropriately determined, and therefore, the psychological state of the subject during blood pressure measurement can be appropriately grasped.

Further, since the apparatus is provided with a correction means for determining the correction amount of the blood pressure value according to the determined psychological state of the subject, for example, there is no correction of the blood pressure value in a calm state, and no correction in a nervous state. Then, the blood pressure value can be corrected by giving a correction amount that reduces the blood pressure value, and thereby the blood pressure value affected by the mental state of the subject (at the time of calm, nervousness, excitement, etc.) can be corrected. , Its exact value can be measured.

In particular, a means for measuring the rate of change of blood pressure during measurement is provided, and if the measured systolic blood pressure value is larger than the reference systolic blood pressure value, if the blood pressure change rate is large, the possibility of a medical condition caused by hypertension is high. Is displayed on the display device, the output of the added electroencephalograph is analyzed, and the ratio of the change in blood pressure to the change in the psychological state determined as a result is monitored. It is possible to point out the possibility of a medical condition to occur, a vascular defect such as cerebral infarction, etc., and to make a preventive and conservative diagnosis. For example, as a result of analyzing the electroencephalogram, if the excitement level rises only a little and the blood pressure value rises significantly, inform the patient that there is "a risk of cerebral infarction etc." I can do it. For this reason, it becomes possible to prevent the occurrence of a medical condition.

[0058]

According to the first aspect of the present invention, the mental state of the subject is appropriately grasped from the brain waves, and the blood pressure value is corrected in accordance with the grasped mental state. An accurate blood pressure value can be measured regardless of the environment and mental state.

According to the second aspect of the present invention, diagnosis advice is performed based on the diagnostic data. Therefore, in addition to the effect of the first aspect, it is possible to encourage the subject to find a new medical condition.

[Brief description of the drawings]

FIG. 1 is a diagram showing a configuration of a blood pressure measurement device of the present invention.

FIG. 2 is a flowchart showing how to measure in the blood pressure measurement device of the present invention.

FIG. 3 shows the processing content of a subroutine “correction of blood pressure value according to mental state” called at steps A3 and A6 in FIG. 2;

FIG. 4 is a flowchart showing processing contents of a subroutine “diagnosis” called in step A8 of FIG. 2;

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 display device 2 input means 3 blood pressure measuring device 4 microcomputer 41 CPU 42 RAM 43 image processing unit 5 electroencephalograph D8 first file D9 second file (analysis data table) D10 third file (psychological state data table) D11 Fourth file (blood pressure value correction data table) D12 Fifth file (blood pressure value reference data table) D13 Sixth file (diagnosis data table)

────────────────────────────────────────────────── ─── Continued on the front page (58) Fields surveyed (Int. Cl. ⁷ , DB name) A61B 5/02-5/0295 A61B 5/0476-5/0484 JICST file (JOIS)

Claims (2)

(57) [Claims] 1. A blood pressure measuring device that measures a subject's blood pressure and displays the systolic blood pressure value and the diastolic blood pressure value on a display device, comprising: an electroencephalograph measuring an electroencephalogram of the subject; An analysis data table storing analysis data obtained by analyzing a psychological state such as a calm state or a nervous state according to a state of an electroencephalogram, and a blood pressure value correction data table storing a correction amount of a blood pressure value to be corrected according to the analysis data. Analyzing the electroencephalogram from the electroencephalograph to obtain the state of the electroencephalogram, searching the analysis data table for analysis data corresponding to the state of the electroencephalogram, and calculating the correction amount of the blood pressure value corresponding to the analysis data by the blood pressure value A blood pressure measurement device comprising: a correction unit that searches a correction data table and corrects the systolic blood pressure value and the diastolic blood pressure value of the subject based on the correction amount of the blood pressure value. 2. A diagnostic data table in which diagnostic data corresponding to a blood pressure change rate is stored, and a blood pressure change rate is determined from a blood pressure being measured, and the diagnostic data corresponding to the change rate is obtained from the diagnostic data table. The blood pressure measurement device according to claim 1, further comprising: means for searching and displaying diagnosis advice based on the diagnosis data on the display device.